CN103854952A - Mass spectrum vacuum ultraviolet ionization source based on optical-window-free gas discharge lamp - Google Patents
Mass spectrum vacuum ultraviolet ionization source based on optical-window-free gas discharge lamp Download PDFInfo
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Abstract
The invention relates to mass spectrometry instruments, in particular to a mass spectrum vacuum ultraviolet ionization source based on an optical-window-free gas discharge lamp. The mass spectrum vacuum ultraviolet ionization source based on the optical-window-free gas discharge lamp comprises the optical-window-free gas discharge lamp and an ionization source cavity, wherein the optical-window-free gas discharge lamp is fixed to the outer wall of the ionization source cavity, a discharge lamp light outlet of the optical-window-free gas discharge lamp is communicated with the ionization source cavity, vacuum ultraviolet emitted by the optical-window-free gas discharge lamp is located inside the ionization source cavity, ion repulsion electrodes, ion transport electrodes and ion extraction electrodes are arranged inside the ionization source cavity and are arranged in sequence in the emergent direction of the vacuum ultraviolet, and the ion repulsion electrodes, the ion transport electrodes and the ion extraction electrodes are arranged at intervals in a coaxial and parallel mode. According to the mass spectrum vacuum ultraviolet ionization source based on the optical-window-free gas discharge lamp, due to the fact that the vacuum ultraviolet with different energy grades and excited-state atoms/ions with different energy grades are generated through gas discharge, ionization selection and ionization efficiency of sample molecules are improved, influence of pollution of an optical window on signal strength can be eliminated, and detection sensitivity and measurement accuracy of the mass spectrum are improved.
Description
Technical field
The present invention relates to mass spectrometer, specifically a kind of mass spectrum vacuum ultraviolet light ionization source based on without optical window formula gaseous discharge lamp.
Background technology
Electron impact ionization source (EI) simple in structure, ionizing efficiency is high, and has abundant spectrogram base resource, therefore becomes the most widely used ionization source in organic substance mass spectrum.But, its energy is the electronics bombardment organic matter samples molecule of 70eV, can produce a large amount of fragment ions, in the time of Analysis of Complex mixture, peak overlap is serious, cause identification of spectrogram difficulty, need to could obtain and analyze reliably data with other analytical method coupling such as gas-chromatography, be therefore unsuitable in real time, on-line analysis.Vacuum ultraviolet ionized is a kind of very effective soft ionization method, and it,, by ionization energy (IE) is directly ionized lower than the material molecule of photon energy absorbs single photon, mainly produces a large amount of molecular ions, and almost there is no fragment ion.By vacuum-ultraviolet light, as mass spectrographic ionization source, the spectrogram obtaining is simple, can directly carry out qualitative and quantitative analysis fast by molecular weight and the strength information of material, to complicated organic mixture can realize in real time, rapid analysis and on-line monitoring.
Conventional vacuum ultraviolet light source mainly comprises gaseous discharge lamp and LASER Light Source, at present, when being used as to mass spectrometer ionization source, these light sources all can use the optical window that special lenses material is made, be less than the vacuum-ultraviolet light of 200nm for transmission peak wavelength, and transmit it in the high vacuum environment of mass spectrometer ionization source.But, use these special lenses materials, as LiF, MgF
2deng, can there is the problem in some practical applications.On the one hand, existing lens material can limit the photon energy that vacuum ultraviolet light source can be launched, the highest LiF optical window of transmission photon energy can transmission photon energy be up to 11.8eV, it common are machine and inorganic matter molecule for ionization energy higher than some of 11.8eV, as CH
4(IE=12.61eV), acetonitrile (IE=12.20eV), SO
2(IE=12.35eV) etc. helpless.On the other hand, optical window can, because of the effect of physics or chemisorbed, pollute, and along with the aggravation of polluting, output intensity can be decayed gradually its surperficial generation in the process using, thereby has affected mass spectrographic detection sensitivity and quantitative accuracy.Therefore, vacuum ultraviolet ionized mass spectrum has been subject to certain restriction in actual applications.
Summary of the invention
The object of the present invention is to provide a kind of mass spectrum vacuum ultraviolet light ionization source based on without optical window formula gaseous discharge lamp, the vacuum-ultraviolet light with different-energy and the excited atom/molecule that utilize gas discharge to produce, put forward the ionizing efficiency of highly ionized selectivity and sample molecule, can eliminate optical window and pollute the impact on signal strength signal intensity, improve mass spectrographic detection sensitivity and measurement accuracy simultaneously.
For achieving the above object, the technical solution used in the present invention is:
Mass spectrum vacuum ultraviolet light ionization source based on without optical window formula gaseous discharge lamp of the present invention, comprise without optical window formula gaseous discharge lamp and ionization source cavity, be fixed on the outer wall of ionization source cavity without optical window formula gaseous discharge lamp, its discharge lamp light-emitting window is connected with the inside of ionization source cavity;
The vacuum-ultraviolet light sending without optical window formula gaseous discharge lamp is positioned at the inside of ionization source cavity, in the inside of ionization source cavity, be disposed with ion repulsion electrode, ion transfer electrode and Ion Extraction electrode along vacuum-ultraviolet light exit direction, ion repulsion electrode, ion transfer electrode and Ion Extraction electrode space, coaxial, be arranged in parallel;
One sample introduction capillary stretches into the inside at ionization source cavity through the outer wall of ionization source cavity, sample introduction gas vent capillaceous is arranged at the region of space between ion repulsion electrode and ion transfer electrode, its gas outlet end is right against the light beam setting of vacuum-ultraviolet light, and sample introduction gas access capillaceous end is connected with sample gas source of the gas;
On ionization source chamber outer wall, be provided with gas vent, gas vent is connected with an oil-sealed rotary pump by vacuum line; Be provided with a mass analyzer in the below of Ion Extraction electrode.
Be the airtight hollow cylinder of being made by insulating material in an end opening, one end without optical window formula gaseous discharge lamp, in the outside wall surface of cylindrical shell, be arranged with radio frequency discharge coil or in the outside wall surface of cylindrical shell, be arranged with pair of metal ring-type radio frequency discharge electrode or on the internal face of cylindrical shell, be provided with pair of metal ring-type direct-current discharge electrode, radio frequency discharge electrode or direct-current discharge electrode are coaxial with cylindrical shell;
Openend is discharge lamp light-emitting window;
Described is radio frequency discharge or direct-current discharge without optical window formula gaseous discharge lamp working method.
To being the mist of one or more above-mentioned gas in helium, neon, argon gas, Krypton, xenon, hydrogen, nitrogen, oxygen without the discharge gas being filled with in optical window formula gaseous discharge lamp; Be 0.1 ~ 100Torr without optical window formula gaseous discharge lamp air pressure inside.
On without optical window formula gaseous discharge lamp outer wall, be provided with gas access, gas access is connected with an intake valve by pipeline, be connected with discharge gas source of the gas in the other end of intake valve, discharge gas enters the inside without optical window formula gaseous discharge lamp by gas access, and is flowed out by openend.
Ion repulsion electrode, ion transfer electrode and Ion Extraction electrode are plank frame, and centre is provided with through hole, and wherein, ion transfer electrode is more than 1 or 2 space, coaxial, the plank frame that be arranged in parallel; The light beam of vacuum-ultraviolet light is parallel to the central area of electrode axis direction through each electrode through hole.
The central area of ion repulsion electrode and Ion Extraction electrode gap forms sample ionization district, and sample molecule produces photo ionization in sample ionization district; The spacing of ion repulsion electrode and Ion Extraction electrode, the length in sample ionization district is 0.1 ~ 10cm.
On ion repulsion electrode, ion transfer electrode and Ion Extraction electrode, according to voltage order from high to low, load successively different voltage, form at sample ionization district axis direction the Ion Extraction electric field that size is 1 ~ 100V/cm.
Ionization source inside cavity air pressure is 0.01 ~ 10Torr, and sample introduction capillary inner diameter size can require to be chosen within the scope of Φ 50 ~ 500 μ m according to ionization source inside cavity air pressure.
Described mass analyzer is time of flight mass analyzer, level Four bar mass analyzer, ion strap mass analyzer, sector magnetic field mass analyzer or ion cyclotron resonance mass analyzer.
Operation principle of the present invention is as follows:
Without optical window formula gaseous discharge lamp inside, high-purity discharge gas produces self-holding glow discharge under the effect of radio frequency high tension or high direct voltage.The atom/molecule of discharge gas is under the excitation of electronics, transit to higher metastable energy level, and the excited atom/molecule spontaneous transition of rear portion in metastable energy level is to lower state, unnecessary energy discharges with the form of photon, thereby produces vacuum-ultraviolet light.Different discharge gass is because of the energy height difference of its metastable energy level separately, the energy of the vacuum-ultraviolet light giving off is also different, therefore by being filled with different discharge gass without optical window formula gaseous discharge lamp inside, can obtain the vacuum-ultraviolet light with different-energy, energy and the wavelength of the radiation photon of some conventional discharge gass are as shown in table 1.
Table 1
Due to the gas discharge lamp structure having adopted without optical window formula, excited atom/molecule G that also can some discharge gas
*enter sample ionization district through discharge lamp light-emitting window and ion repulsion electrode.In sample ionization district, the organic matter samples molecule M and the carrier gas molecules X(that have in discharge gas excited atom/molecule and the sample gas of higher-energy work as G
*energy during higher than the ionization energy of X) between after collision, there is Penning ionization (Panning Ionization):
M+G
*→M
++e
-+G
X+G
*→X
++e
-+G
M in formula
+for sample ions, G be ground state discharge gas atom/molecule, X
+for carrier gas ion, e
-for electronics.
As carrier gas ion X
+recombination energy during higher than the ionization energy of organic matter samples molecule M, carrier gas ion X
+and between organic matter samples molecule M, can also produce electric charge and shift ionization (Charge Exchange Ionization):
M+X
+→M
++X
Penning ionization and electric charge shift ionization and all belong to chemi-ionization, are very efficient soft ionization methods.G
*the energy of metastable energy level of living in and X
+recombination energy mostly in about 10eV, when it reacts with organic matter samples molecular collision, transfer to energy on organic matter samples molecule only a little more than its ionization energy, therefore, what organic matter samples molecule obtained after chemi-ionization mostly is molecular ion, and little fragment ion.In sample ionization district, chemi-ionization to vacuum ultraviolet ionized be one strong auxiliary and supplement.
The present invention adopts gaseous discharge lamp without optical window formula as mass spectrographic vacuum ultraviolet light ionization source, has advantages of following outstanding:
1), except vacuum ultraviolet ionized, the excited atom/molecule of discharge gas enters behind sample ionization district, can and sample gas between there is chemi-ionization, play an auxiliary electrical from effect, can greatly improve the ionizing efficiency of organic matter samples molecule.
2) by being filled with different discharge gass in gaseous discharge lamp, can producing vacuum-ultraviolet light and the excited atom/molecule with different-energy, thereby put forward highly ionized selectivity.
3) eliminate optical window without the design of optical window and polluted the impact on output intensity, effectively avoided the decay of signal strength signal intensity, improved mass spectrographic detection sensitivity and measurement accuracy.
Brief description of the drawings
Fig. 1 is the mass spectrum vacuum ultraviolet light ionization source structural representation based on without optical window formula gaseous discharge lamp of the present invention.
Fig. 2 uses respectively high-purity He, Ar, N in embodiment 1
2the mass spectrogram of the 50ppm benzene,toluene,xylene obtaining as discharge gas.
Embodiment
Referring to Fig. 1, is structural representation of the present invention.Mass spectrum vacuum ultraviolet light ionization source of the present invention, by without optical window formula gaseous discharge lamp 2 and ionization source cavity 8, is fixed on the outer wall of ionization source cavity 8 without optical window formula gaseous discharge lamp 2, its discharge lamp light-emitting window 4 is connected with the inside of ionization source cavity 8;
The vacuum-ultraviolet light 12 sending without optical window formula gaseous discharge lamp 2 is positioned at the inside of ionization source cavity 8, in the inside of ionization source cavity 8, be disposed with ion repulsion electrode 5, ion transfer electrode 6 and Ion Extraction electrode 7 along vacuum-ultraviolet light 12 exit directions, ion repulsion electrode 5, ion transfer electrode 6 and Ion Extraction electrode 7 spaces, coaxial, be arranged in parallel;
One sample introduction capillary 1 stretches into the inside at ionization source cavity 8 through the outer wall of ionization source cavity 8, the gas vent of sample introduction capillary 1 is arranged at the region of space between ion repulsion electrode 5 and ion transfer electrode 6, its gas outlet end is right against the light beam setting of vacuum-ultraviolet light 12, and the gas access end of sample introduction capillary 1 is connected with sample gas source of the gas 11;
On ionization source cavity 8 outer walls, be provided with gas vent, gas vent is connected with an oil-sealed rotary pump 9 by vacuum line; Be provided with a mass analyzer 13 in the below of Ion Extraction electrode 7.
Be the airtight hollow cylinder of being made by insulating material in an end opening, one end without optical window formula gaseous discharge lamp 2, in the outside wall surface of cylindrical shell, be arranged with radio frequency discharge coil or in the outside wall surface of cylindrical shell, be arranged with pair of metal ring-type radio frequency discharge electrode or on the internal face of cylindrical shell, be provided with pair of metal ring-type direct-current discharge electrode, radio frequency discharge electrode or direct-current discharge electrode are coaxial with cylindrical shell; Openend is discharge lamp light-emitting window 4.
On without optical window formula gaseous discharge lamp 2 outer walls, be provided with gas access, gas access is connected with an intake valve 3 by pipeline, be connected with discharge gas source of the gas 10 in the other end of intake valve 3, discharge gas enters the inside without optical window formula gaseous discharge lamp 2 by gas access, and is flowed out by openend.
Ion repulsion electrode 5, ion transfer electrode 6 and Ion Extraction electrode 7 are plank frame, and centre is provided with through hole, and wherein, ion transfer electrode 6 is more than 1 or 2 space, coaxial, the plank frame that be arranged in parallel; The light beam of vacuum-ultraviolet light 12 is parallel to the central area of electrode axis direction through each electrode through hole.
The central area at ion repulsion electrode 5 and Ion Extraction electrode 7 intervals forms sample ionization district 14, and sample molecule produces photo ionization in sample ionization district 14; The spacing of ion repulsion electrode 5 and Ion Extraction electrode 7, the length in sample ionization district 14 is 0.1 ~ 10cm.
Be specially:
Adopt without optical window formula gaseous discharge lamp 2 as vacuum ultraviolet light source, by intake valve 3 to being the mist of one or more above-mentioned gas in helium, neon, argon gas, Krypton, xenon, hydrogen, nitrogen, oxygen without the discharge gas being filled with in optical window formula gaseous discharge lamp 2.Sample gas under atmospheric pressure, under the poor effect of ionization source cavity 8 inner and outer air pressures, directly enters sample ionization district 14 through sample introduction capillary 1.
Carry out the air inflow of controlled discharge gas and sample gas according to the change of the adjusting of intake valve 3 flows and sample introduction capillary 1 internal diameter and length, regulate without the air pressure in optical window formula gaseous discharge lamp 2 and ionization source cavity 8, without the interior generation high strength of optical window formula gaseous discharge lamp 2, stable electric discharge, make, in ionized region, abundant collision occurs between gas molecule, to meet the requirement of molecular ion reaction in chemi-ionization simultaneously.Be 0.1 ~ 100Torr without optical window formula gaseous discharge lamp 2 air pressure inside, ionization source cavity 8 air pressure inside are 0.01 ~ 10Torr, and sample introduction capillary 1 internal diameter size can require to be chosen within the scope of Φ 50 ~ 500 μ m according to ionization source cavity 8 air pressure inside.
On ion repulsion electrode 5, ion transfer electrode 6 and Ion Extraction electrode 7, according to voltage order from high to low, load successively different voltage, form at sample ionization district 14 axis directions the Ion Extraction electric field that size is 1 ~ 100V/cm.
When application, utilize high-voltage radio-frequency voltage or high voltage direct current to be pressed in the stable glow discharge of the inner generation of unglazed window formula gaseous discharge lamp 2, the vacuum-ultraviolet light producing and the excited atom/molecule of discharge gas enter into sample ionization district 14 through the central through hole of discharge lamp light-emitting window 4 and ion repulsion electrode 5, and interact between the sample molecule entering in sample introduction capillary 1, make it obtain soft ionization by vacuum ultraviolet ionized and mode chemi-ionization, produce sample ions.Under the effect of the Ion Extraction electric field forming at ion repulsion electrode 5, ion transfer electrode 6 and 7 making alives of Ion Extraction electrode, the sample ions in sample ionization district 14 directly enters in mass analyzer 13 and detects via the central through hole on Ion Extraction electrode 7.On ionization source cavity 8 sidewalls, the rear end of gas vent is connected with oil-sealed rotary pump 9, and the interior unnecessary gas molecule of ionization source cavity 8 is extracted out by oil-sealed rotary pump 9 by the gas vent on ionization source cavity 8 sidewalls.
Embodiment 1
For the examination of mass spectrum vacuum ultraviolet light ionization source ionization performance of the present invention, use respectively high-purity He, Ar, N
2as discharge gas, test concentrations is the mass spectrogram of the benzene,toluene,xylene biased sample gas of 50ppm.Wherein, the carrier gas in sample gas is high-purity O
2, sample introduction capillary is that an internal diameter is the quartz capillary that Φ 250 μ m, length are 100cm, the air pressure in ionization source cavity is 0.3Torr, is 1Torr without optical window formula gaseous discharge lamp internal gas pressure.By this ionization source and the coupling of time of flight mass analyzer, use radio frequency high tension electric discharge, the mass signal obtaining is as shown in Figure 2.Due to O
2ionization energy (IE=12.1eV) lower than excited atom/molecule He
*, Ar
*, N
2 *energy, so O
2obtain O by Penning ionization
2 +, benzene (IE=9.24eV), toluene (IE=8.83eV), paraxylene (IE=8.44eV) that ionization energy is lower can pass through respectively vacuum ultraviolet ionized and He
*, Ar
*, N
2 *between Penning ionization, and and O
2 +between electric charge shift ionization, obtain molecular ion.What in Fig. 2, occur is mainly the molecular ion peak of each component, and spectrogram is simple, is conducive to quick, the online qualitative and quantitative analysis of COMPLEX MIXED matter sample.
Claims (9)
1. the mass spectrum vacuum ultraviolet light ionization source based on without optical window formula gaseous discharge lamp, it is characterized in that: comprise without optical window formula gaseous discharge lamp (2) and ionization source cavity (8), be fixed on the outer wall of ionization source cavity (8) without optical window formula gaseous discharge lamp (2), its discharge lamp light-emitting window (4) is connected with the inside of ionization source cavity (8);
The vacuum-ultraviolet light (12) sending without optical window formula gaseous discharge lamp (2) is positioned at the inside of ionization source cavity (8), in the inside of ionization source cavity (8), be disposed with ion repulsion electrode (5), ion transfer electrode (6) and Ion Extraction electrode (7) along vacuum-ultraviolet light (12) exit direction, ion repulsion electrode (5), ion transfer electrode (6) and Ion Extraction electrode (7) space, coaxial, be arranged in parallel;
One sample introduction capillary (1) stretches into the inside in ionization source cavity (8) through the outer wall of ionization source cavity (8), the gas vent of sample introduction capillary (1) is arranged at the region of space between ion repulsion electrode (5) and ion transfer electrode (6), its gas outlet end is right against the light beam setting of vacuum-ultraviolet light (12), and the gas access end of sample introduction capillary (1) is connected with sample gas source of the gas (11);
On ionization source cavity (8) outer wall, be provided with gas vent, gas vent is connected with an oil-sealed rotary pump (9) by vacuum line; Be provided with a mass analyzer (13) in the below of Ion Extraction electrode (7).
2. the mass spectrum vacuum ultraviolet light ionization source based on without optical window formula gaseous discharge lamp according to claim 1, is characterized in that:
Be the airtight hollow cylinder of being made by insulating material in an end opening, one end without optical window formula gaseous discharge lamp (2), in the outside wall surface of cylindrical shell, be arranged with radio frequency discharge coil or in the outside wall surface of cylindrical shell, be arranged with pair of metal ring-type radio frequency discharge electrode or on the internal face of cylindrical shell, be provided with pair of metal ring-type direct-current discharge electrode, radio frequency discharge electrode or direct-current discharge electrode are coaxial with cylindrical shell;
Openend is discharge lamp light-emitting window (4);
Described is radio frequency discharge or direct-current discharge without optical window formula gaseous discharge lamp (2) working method.
3. the mass spectrum vacuum ultraviolet light ionization source based on without optical window formula gaseous discharge lamp according to claim 1 and 2, is characterized in that:
To being the mist of one or more above-mentioned gas in helium, neon, argon gas, Krypton, xenon, hydrogen, nitrogen, oxygen without the discharge gas being filled with in optical window formula gaseous discharge lamp (2); Be 0.1 ~ 100Torr without optical window formula gaseous discharge lamp (2) air pressure inside.
4. the mass spectrum vacuum ultraviolet light ionization source based on without optical window formula gaseous discharge lamp according to claim 2, is characterized in that:
On without optical window formula gaseous discharge lamp (2) outer wall, be provided with gas access, gas access is connected with an intake valve (3) by pipeline, be connected with discharge gas source of the gas (10) in the other end of intake valve (3), discharge gas enters the inside without optical window formula gaseous discharge lamp (2) by gas access, and is flowed out by openend.
5. the mass spectrum vacuum ultraviolet light ionization source based on without optical window formula gaseous discharge lamp according to claim 1, is characterized in that:
Ion repulsion electrode (5), ion transfer electrode (6) and Ion Extraction electrode (7) are plank frame, and centre is provided with through hole, and wherein, ion transfer electrode (6) is more than 1 or 2 space, coaxial, the plank frame that be arranged in parallel; The light beam of vacuum-ultraviolet light (12) is parallel to the central area of electrode axis direction through each electrode through hole.
6. the mass spectrum vacuum ultraviolet light ionization source based on without optical window formula gaseous discharge lamp according to claim 1 or 5, is characterized in that:
The central area at ion repulsion electrode (5) and Ion Extraction electrode (7) interval forms sample ionization district (14), and sample molecule produces photo ionization in sample ionization district (14); The spacing of ion repulsion electrode (5) and Ion Extraction electrode (7), the length of sample ionization district (14) is 0.1 ~ 10cm.
7. according to the mass spectrum vacuum ultraviolet light ionization source based on without optical window formula gaseous discharge lamp described in claim 1 or 6, it is characterized in that:
Upper according to voltage order from high to low in ion repulsion electrode (5), ion transfer electrode (6) and Ion Extraction electrode (7), load successively different voltage, form at sample ionization district (14) axis direction the Ion Extraction electric field that size is 1 ~ 100V/cm.
8. the mass spectrum vacuum ultraviolet light ionization source based on without optical window formula gaseous discharge lamp according to claim 1, is characterized in that:
Ionization source cavity (8) air pressure inside is 0.01 ~ 10Torr, and sample introduction capillary (1) internal diameter size can require to be chosen within the scope of Φ 50 ~ 500 μ m according to ionization source cavity (8) air pressure inside.
9. the mass spectrum vacuum ultraviolet light ionization source based on without optical window formula gaseous discharge lamp according to claim 1, is characterized in that:
Described mass analyzer (13) is time of flight mass analyzer, level Four bar mass analyzer, ion strap mass analyzer, sector magnetic field mass analyzer or ion cyclotron resonance mass analyzer.
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| CN105632869A (en) * | 2014-11-06 | 2016-06-01 | 中国科学院大连化学物理研究所 | Vacuum ultraviolet light ionization source device based on glow discharge |
| CN105655226A (en) * | 2014-11-14 | 2016-06-08 | 中国科学院大连化学物理研究所 | Composite ionization source for vacuum ultraviolet light ionization and chemical ionization |
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| CN108091546B (en) * | 2016-11-21 | 2020-02-07 | 中国科学院大连化学物理研究所 | Discharge gas assisted windowless radio frequency lamp mass spectrum ionization source |
| CN108091546A (en) * | 2016-11-21 | 2018-05-29 | 中国科学院大连化学物理研究所 | A kind of windowless radio-frequency lamp mass spectrum ionization source of discharge gas auxiliary |
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| CN109884168A (en) * | 2017-12-06 | 2019-06-14 | 中国科学院大连化学物理研究所 | A kind of device and method for catalytic reaction process on-line analysis |
| CN108181943A (en) * | 2017-12-21 | 2018-06-19 | 中国电子产品可靠性与环境试验研究所 | gas concentration control method, device, storage medium and computer equipment |
| CN109212113A (en) * | 2018-10-22 | 2019-01-15 | 南京国科医工科技发展有限公司 | A kind of ion trapping gas molecule separation method and device |
| CN109406689B (en) * | 2018-10-22 | 2023-05-12 | 南京国科精准医学科技有限公司 | Ion permeation gas molecular separation method and device |
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| CN109212113B (en) * | 2018-10-22 | 2023-05-12 | 南京国科精准医学科技有限公司 | Ion trapping gas molecule separation method and device |
| CN111211035A (en) * | 2018-11-22 | 2020-05-29 | 中国科学院大连化学物理研究所 | Adjustable radio frequency permeation magnetic field enhanced ionization source |
| CN111223747A (en) * | 2018-11-27 | 2020-06-02 | 中国科学院大连化学物理研究所 | Energy-adjustable discharge photoionization source for mass spectrum |
| CN112908830A (en) * | 2019-12-04 | 2021-06-04 | 中国科学院大连化学物理研究所 | Atmospheric pressure photoionization source device for detecting volatile organic compounds in water |
| CN112908828A (en) * | 2019-12-04 | 2021-06-04 | 中国科学院大连化学物理研究所 | Composite ionization source for surface acoustic wave ionization and atmospheric pressure photoionization for liquid sample detection |
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| CN110887713A (en) * | 2019-12-04 | 2020-03-17 | 湖南农业大学 | Dark tea brown reference substance and application thereof |
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| CN112259440A (en) * | 2020-10-29 | 2021-01-22 | 上海裕达实业有限公司 | Vacuum ultraviolet internal ionization mass spectrometry device and mass spectrometry method |
| CN112259440B (en) * | 2020-10-29 | 2023-12-05 | 上海裕达实业有限公司 | Ionization mass spectrometry device and method in vacuum ultraviolet light |
| CN114597113A (en) * | 2020-12-04 | 2022-06-07 | 中国科学院大连化学物理研究所 | Photoionization source capable of automatically tuning signal intensity |
| CN114597113B (en) * | 2020-12-04 | 2024-08-20 | 中国科学院大连化学物理研究所 | Photoionization source capable of automatically tuning signal intensity |
| CN114220728A (en) * | 2021-11-12 | 2022-03-22 | 中国人民解放军战略支援部队航天工程大学 | Inert gas discharge vacuum ultraviolet light source |
| CN114220728B (en) * | 2021-11-12 | 2023-09-12 | 中国人民解放军战略支援部队航天工程大学 | Inert gas discharge vacuum ultraviolet light source |
| CN114334603A (en) * | 2021-12-14 | 2022-04-12 | 中国计量科学研究院 | Glow discharge electron bombardment ionization source mass spectrum system |
| CN114334603B (en) * | 2021-12-14 | 2024-05-03 | 中国计量科学研究院 | Glow discharge electron bombardment ionization source mass spectrum system |
| CN114764084A (en) * | 2022-04-01 | 2022-07-19 | 北京东西分析仪器有限公司 | Windowless far ultraviolet light source |
| WO2024159864A1 (en) * | 2023-02-02 | 2024-08-08 | 清华大学深圳国际研究生院 | Hydrogen-assisted ultraviolet light ionization device, method, and mass spectrometer |
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